Guide to Common Garden Pests in Hong Kong

Hong Kong's humid subtropical climate creates an ideal environment for a variety of garden pests. This guide outlines some of the most common pests you may encounter in your garden, along with tips for identification and management.

1. Aphids

Identification:
Small, sap-sucking insects that can be green, black, or brown. They often cluster on new growth and the undersides of leaves.

Management:
Encourage natural predators like ladybirds. Use insecticidal soap or neem oil if infestations are severe.

2. Mealybugs

Identification:
White, cottony masses found in leaf joints and on stems. They feed on plant sap and can cause yellowing leaves.

Management:
Manual removal with a cotton swab dipped in alcohol can be effective. Systemic insecticides may be necessary for larger infestations.

3. Scale Insects

Identification:
Small, oval-shaped insects that attach to stems and leaves, often resembling small bumps. They can be brown or black.

Management:
Similar to mealybugs, use a cotton swab with alcohol for small infestations. Introduce natural predators or apply horticultural oil for significant problems.

4. Spider Mites

Identification:
Microscopic pests that create fine webbing on the undersides of leaves. Leaves may have a stippled appearance and can turn yellow.

Management:
Increase humidity around plants and wash leaves with water. Insecticidal soaps or miticides may be required for larger problems.

5. Whiteflies

Identification:
Small, white, flying insects that gather on the undersides of leaves. They excrete a sticky substance known as honeydew, leading to sooty mould.

Management:
Use yellow sticky traps to monitor and reduce numbers. Introduce natural predators or apply insecticidal soap if needed.

6. Thrips

Identification:
Tiny, elongated insects that cause damage by piercing plant tissue and feeding on sap. Damage appears as silver streaks or white spots on leaves.

Management:
Regularly monitor and remove infested foliage. Use insecticidal soap or specific thrip insecticides if necessary.

7. Caterpillars

Identification:
Larval stage of moths and butterflies, which can range in colour and size. They often chew large holes in leaves.

Management:
Handpick visible caterpillars or use organic insecticides like Bacillus thuringiensis (Bt) to target specific species.

8. Termites

Identification:
Wood-destroying pests that can cause significant damage to wooden structures and plant roots. Look for mud tubes or hollowed wood.

Management:
Remove decaying wood and other cellulose sources. Termite baits and professional pest control services may be necessary for infestations.

Managing garden pests in Hong Kong requires vigilance and an integrated approach. Regular monitoring and early action are key to preventing infestations and maintaining a healthy garden. By understanding the common pests you may encounter, you can take appropriate measures to protect your plants and ensure their vitality.